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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6466e766c6383f7ea412579d052786523c03cb35707ce671ae567e3b9e5dc5d0' 
  AND token = 'wqIjKADLXSsBM8oUP3WVXakysujhv68coOkclS8lMtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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