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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e0e076f94bcf55937cb709c4c8ec8548ccf553e01686d4db065e880e6f6880' 
  AND token = '6pjcSgpPY1SOMkc4DAfV2lCq1/uIZx0mUReRS+WO4eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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