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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d4624e34fed06ece93b6aaa95ae48bbe849b035ed72af2e9a430c92302f8b9' 
  AND token = 'qnNSs6eR+PKLLPKhpdqsZtWgo4N3p+lLUg6uatWobq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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