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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f47cd262d2ebbf78f1732db1a1bebed7afe52aa995c40c8a3bf19423f76cdab' 
  AND token = 'F45CBD9A0+XW+/IYqOJrUOkrwW28UkdbqRlC5R4Qomc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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