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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe01c04f4f3daa14d5013d358e91b3a540371b400c3228a9bc6fc8d67dc308ab' 
  AND token = 'nYAJ4jzsV+XRJSl/NzvWr4wQDlonRpoSp2WkclAo73I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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