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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99c252770dad695df6026aec8c905e57f4cda405e94b0c3cba3f3c55dcff5b2' 
  AND token = 'OsuWVRjksRiBaeKsCIq+OfBnKBDrFH09whdwNns4+xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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