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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193dc95a4bdda49f561bf56c25c03c55726791dd6d48b877596150c591e99482' 
  AND token = 'gaSQo+kgozFCGVODohNViuuuQ9VH+87R6LHdISrdTng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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