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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b01d0acf0540ac4b5e62da87f73c3424f25ef933605ef8c3cdff44cbdc27325' 
  AND token = '9TAFMOK/kIzNwVl1vIir2rVTZTKxgGMLT+Jtk0GdDIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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