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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aafae5b36ff73e7fdd6314c99d52d133072cb4b7919d914e9e0778bd02d066e' 
  AND token = 'f19SpVNEPmX6azQjTI9Fz4dUjc4IcLucL/3RFpmnzy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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