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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca06837a5d8ed730749ddda0df0c03034400b6deeed7469632ad9aaffd036d16' 
  AND token = 'YGebvdK4HHLaMTvdG8s27xxgYj8WPVKZKtYJF8GV+VI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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