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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4776591d935ae08e36be230ec0184c26a41cc72144ff6137a4e4a07e27122cc6' 
  AND token = 'DtRqwJ+FxKYkXQ0U9Hd8mgdgrfWAAblw4Sjqf6p4u88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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