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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd111a26c1ed5a49f8a6c32e40d3ec7b00c70882c61cbe166fdf8c5af7098ab94' 
  AND token = 'LhxLOQQbligJr0zzF3Z25lQif4Q7ABKgILJ4i5/g7Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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