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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ea024d6bba88c40952971733ea8b5713deaa02c5772fe3838302159a77d017' 
  AND token = 'd3z+bhQGNRxvzI9WMmSWMidrDIQIVhpGtnZiypiKOxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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