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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4b47ac72974802a9ab51188407fbda0ad38f09c75b3a9e22258fe3655cde4d' 
  AND token = 'cCw4Q+5z/8+XCG5hLRqZ8Fwnw4yAmeUwpZz0TyQsErw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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