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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0efc31141724ba98413e386b5774dac326991545f7de708ec7a35748e6fff5fd' 
  AND token = 'ClY1c1nv4nqJUvDlgpW+zyHoRXm9kaJi5oYvayK8U9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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