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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef416b6ca157de5e4c92e630de0457a15fa098981100a1bd91b6be7c1c3d160b' 
  AND token = 'UYikKUM/grAnYm2K8cJ/mjHGIarYaEkURD4t9slDppI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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