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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5b5c72e62b2397189fcfcdc29f85d0721e9d69b89caa44cdd62152e40942c0' 
  AND token = 'NhmXzVleLgL5v975IKkd6Ic+F9SjgA4jDoqund/F3Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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