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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '663d945c68cc73df47de7ffe79fcfe8717ba323dd730f36fe6db95ba0b6105d6' 
  AND token = 'CNA2vDbRhNA77c+vAuj1SYQt6u2FfJY08izqKUrk51M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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