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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c8be3e29a500c29f1ab26cb60b45ebc29f52421243919ee22eb5b936490a1e' 
  AND token = 'l4ouI9awa9/w0XYGxbOldWIJ0jvQ39Ny1382FMJpnQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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