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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97fc930f6c43c4833019ce231e992e4e42694b2fd84cb00ac9dc22e3b8d270f' 
  AND token = 'fuG6R/TZdgf9JJjZoLf9FgUqLipJ2WuawHTZrDQTCWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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