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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8711ce123a0a4d5b8ff4cf490ff853f36f1933b5aff6d01f2fe41c388f09fb' 
  AND token = 'ef04Ps3gqEAMDYvUntjsuyuP/g4kxcyrQQaOvP/FPDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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