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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b85be9271e60e4d8c718c8553d6d7b6b12a234e7bd70cef155be1cdfbcd7ed' 
  AND token = 'WOR/g6dD6HlU1BFQRSNIs3mEvYHdY6vbLwHnZzzdnQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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