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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fa421c84526ae4323357f642c92ca5a7d9a1ea5c6f0382e06b6506a48323883' 
  AND token = '6hNo7L9xuQvOEPvjCK6pwgnwjYD4ZOqjchmEjjcPab4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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