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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37caff0e717cd917bc1d07db3f065feba21df9b27a3dbf7c05ac66d06ff4d79c' 
  AND token = '7NmL5njuwJodUbH8EcjiarIWmZfAUR5igaOFitgh+H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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