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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78bbc14ae4c7635ce8013cfd962e64f3e0556858d58cbb7f07453f0f04c8df9' 
  AND token = 'M3JeEbp/6eaR0sAn7w9RHug+tQqhtbFZuTL09Nd+B20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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