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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68602409725049cfebaf6bd87f3d9eacb4e4e9df66a4f4ac4cd8fc4bb5fa0772' 
  AND token = 'CJbboArgv0v93MKZRH4NrZuGmCRTYTN6Z2rZaLB1pL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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