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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947eb282590ccab6e5fa3cf726bd5257b2524faea140a6728f48d48d92bd2107' 
  AND token = 'Xy8aaSsnydf4fItBrHvWof1gKUy3RTZ0bg0z9KYGzKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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