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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '462bbaf14e7aa712f0252324aa8f83d9abd7e90809608617c2da7e6a94adbfcd' 
  AND token = 'EY+uiYYSCT8Ekq3QIjOJJcbzfX4XtUiufaa7Z2XQOpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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