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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a91f2da124b031d7ed8fcf10cf5582c09f48b77a34bb3242f078b0fd9ed2af5' 
  AND token = '2Ogmib7NrKMQECZqDfi3aVAdlOg0v8RH3nFQiomMDWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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