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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9c9e665a84857d8b54e4e2b01e4a4f00504230dbf93eb9f1e9e9d83136f64e' 
  AND token = 'rJ3IozBU865isRyMJQitIwKa5yUzeHtRyKCaSkW6ceU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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