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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0196dae51ff61eb3bbcf13a664033f45b6425b17ea5c10c3630a6b3c7e319dcf' 
  AND token = 'v0H4tt0I7G8B5KwR4d51FN4JBKglyUWnPjCFLJ2WVEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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