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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672ab19974e4cc789a57edb483c47ec52ef2912d6b6145ae28d51b6a28ac86b9' 
  AND token = 'H6MFMON4O5er3KJbOjXHWs+MjtoZvmIbOrfxQKuWSmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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