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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90d9b7b77ac21d3b6bd6014f880b8d8c2bd95354b9e6ec3bd7468625772be7f8' 
  AND token = 'eIldTkaKKOuboqgDDyNno6X4dOZ0iEU55ENawQUhnlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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