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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed023e72982be29c898e717c2fd85225dc66233f9501d5ffa7ecd3018cae6a95' 
  AND token = 'X/bAG4jjG5ZLdf8KR7WO3yWxsOXNmXyltTN1fW/+aT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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