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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ea234c7af386190ba8501a56db119ef197df34b2aa759aa51e520c47c08474' 
  AND token = '80BkoG/CPIjySBPEZzw+jbTrPpTpbFwcx4eiGYLUeaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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