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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '181a70bcb82818b2232543d0848245ce971a2a206c21120d564379ccd9e364b8' 
  AND token = 'g/pM5lDsOiQGwF9wLUGJyy0Ap6xdA7Rx7KTOAYDRYB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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