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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c12f544c8b07c0affcc45204736230499bb365b0b4193dab618cee9064cbff9' 
  AND token = 'MhPXlj4p4YB1oUf5Y3e0lT6XhGECtgNB1voLOUpnkns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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