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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e8687af482c1488e99637341e24c3a532f2654341dfd54ad2a89a464e334a3' 
  AND token = '+SMK8jwCCJdb8dBEa2eW5YTDxaYdXLImymUAv0N4uEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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