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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7226f81cd3cb2cc388c9a31a7fe7bc252e8917af0d1b10d8201653de83d99ce' 
  AND token = 'OeaorJlPwGRqq0FjlDqKu8gHhr7K4IWzD6g5aRawgnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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