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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc5bb27e7030f263745776d0406a26415a815913e0594bf78a3ee983301b628' 
  AND token = 'yql+EKsv7wMP+4B4jXyXUSMyy4lff4tMTCCS0/NXM2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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