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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98bdc1ee922a6206ee4f8e1b6e69301bd71fbfb0054693dd92f541a46214988e' 
  AND token = 'NK9kizTUceNtMwVpOvZH0OVyfMLTIztrDslWprE96eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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