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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf5d9b945bbd6c4713ef3a6733f291ec7d1c9975990ef5576cd679e65889ec1' 
  AND token = 'tz3ISHXJC+5aNnE/yW6J0DGGwK7WP4QxvB8kr12C11I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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