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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79d164d1bdc9cc1e6c70de4f16762b0609409a67fb2ba7c8e5bc6180c72d8cb' 
  AND token = 'V9eVrqrtt58t1+T/7IHQ1i9+fpQPk5dAcE+sl7CrhLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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