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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6efd1749d088e7b78b19e2d712b45e4f3c54aa8a643f07c548d64889f2d78209' 
  AND token = 'zVunvvUxsZMbadpRg74i4E1bxHP+bBu4xfvgoKN2MMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}