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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f356e456a94d6f0856e43ebe87ed1057a5f2534b0854b0c6beae72a472a23583' 
  AND token = 'bHGIT5y0V5rRxbJ9f2qbmMJLPGz0Ury5Ms5lpD3w/SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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