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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c570bc59671f36fb796ddc34ccec043bb2a95b45e8862c16c2a95be6f2eea86' 
  AND token = '+Ut21HsZHR41EDGgcy+v5rHBEM/OL+q1wpwKbTFXl2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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