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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b87e68ce9548652f9782db0993dde3f619b374798148bbcdbc0db9ca4cc051' 
  AND token = '0KFudx6wh4xWmZi/M4pEI/H9J6KpbPvyNkU8FLqwqDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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