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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7acde791e3a15b0f104bcfa38bba0037367cc44845954b5e311d61ff0920e5' 
  AND token = 'iOYkJ3dFn9jFm5PwGEz7GyDXWWF9i6sv4/6GOcmU/38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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