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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e59dec388b243de968d4f2d0a1b1a68815833d68f065f3504ff92b15c4693161' 
  AND token = 'oVHPuYway/dCa1YMmMXqPoTaXPIRC6sMztSVrMWhj6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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