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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a129c2f1ff903c82b29fc7203ea6413e01ee3590a35b20ed328b030e889259' 
  AND token = '6kqt6FJ3zXOmiUoSHDtRMLg0E/nbZW4uEohLf4M/Peg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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