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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d11574e0d836372587df1d8650a8eefc17a75962341abbac9fc5213a025234a' 
  AND token = 'oR5YESklr84byc5iioNM6UNFSV+iCKUq0zwCST4Qu4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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