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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd590aa38df13149177f198e26b151c8de5aa2ed31668722dfe2fa93547105a7b' 
  AND token = 'sdEzf8w/CoxsH0E40iTSSvaCMb7dsmUJajizBD72IPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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