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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '048770493dc8c3369060981de760ce8c09061580236a820a7ce6918e6ec6578d' 
  AND token = 'DOumm7gxSru6LkusgWrZWHFwBnLUL/1OYCPJstx7N6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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