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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b887a44a286368f3291e86a5cdec8c832775ffc356cc1869ae2a3ea03d1b6bbb' 
  AND token = 'gqnBu4EYJrWN5aOgblvXqJA8f9DipEZqhPcflZRQmiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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