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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e67749196eae702bda23ac5b497adc2e94cd093432260d240bd39fe2ee89b22' 
  AND token = '6Bcj7xWOkS8eI66IwMvp1hYrOaOjNDYdQBhY4ai3DqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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