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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb20f983ff506ad4a3ba7e94de01d7f646340e7ccb58d31fa6a9de2ef2136b7' 
  AND token = 'j7SCzJxEgSVqT6i7zMqVG40aymMhiaPT0YFR6vlvvHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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