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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906bf92fb0e758593a3485b191eeeedc1c4b31a4e24e9646f6d152605eec5431' 
  AND token = 'wpJdwXA3hWZ1zyjlv2706yMDn8ODYt6fMgYCWLD2Rdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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