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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b085775b15daa0101231f5215197152d4b26702ca1558f9769c090593056dd38' 
  AND token = 'sLTH5tg0BNWY569eY0m5UAMsQRwNqO6AvuTlqkTcxVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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