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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f4188587161f911d901600778b425057be0f69f86056b7e274ddd81185a7f18' 
  AND token = 'hqY4BOm3hwePvbscQJe9lfyNv+tJ4AlBgmn91d/w2jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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