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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f600c7a5ce074cecb9d697d267ffe7ba24a429f627e5562387546ba0e5a52a3b' 
  AND token = 'tYXoTWk8qCysVfwtVqceB7TAsIsXGbYY8hDegwLKZGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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