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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744e210e88b80e45fa95ff261406a262622ad0d83347bd7308a70fb8483b66df' 
  AND token = '6QmzNwk24qbl8yeGXly1RqtnJmUm4d8z72xblXdZCOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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